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<h1 id="-">第二章作业</h1>
<h2 id="1-">1.单项选择题</h2>
<h3 id="1-1-string-">1.1 使用string类建立对象的不正确方式是()。</h3>
<pre><code>    A.string str(&quot;OK&quot;);
    B.string str=&quot;OK&quot;;
    C.string str;
    D.string str = &#39;OK&#39;;
</code></pre><h3 id="1-2-">1.2 下面所列各项中，不是面向对象程序设计所具有的特点的选项是</h3>
<pre><code>    A. 封装 
    B. 继承
    C. 抽象
    D. 函数
</code></pre><h2 id="2-">2.作图题</h2>
<h3 id="2-1-12-11-">2.1 已知一个学生类具有性别和年龄两个属性，男学生张明的年龄为12岁，女学生李红的年龄为11岁。给出这个学生类的类图和他们的对象图。</h3>
<hr>
<h3 id="2-2-">2.2 一个圆具有圆心坐标和半径两个属性，并且能够给出圆的面积，请画出这个圆类的类图。</h3>
<hr>
<h3 id="2-3-">2.3 画出一个班级类的类图，为它设计必需的属性以表示这个类的特征。</h3>
<hr>
<h3 id="2-4-">2.4 画出一种电话卡的类图，为它设计必要的属性。</h3>
<hr>
<h3 id="2-5-">2.5 为上题的电话卡设计必要的成员函数，以便提供基本服务。</h3>
<hr>
<h2 id="3-">3.编程题</h2>
<h3 id="3-1-">3.1 使用多种方法编写将两个字符串连接在一起的程序。</h3>
<hr>
<h3 id="3-2-string-str-we-are-here-h-">3.2 已知一个string的对象str的内容为&quot;We are here!&quot;，使用多种方法输出字符&quot;h&quot;。</h3>
<hr>

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